Tanegashima is an exposed island situated south of Kyushu, Japan, renowned for its consistent surf and pristine coastal environment. The bathymetry is a complex mix of white silica sandbanks interspersed with shallow, flat coral and volcanic rock reefs.
Forecast accuracy at Tanegashima
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Best time to go
No great windows in the next 2 days
Best available option is Today around 5am (score: 30). Conditions are below the Good threshold but may still be surfable.
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Session journal
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7-day forecastRecent form
Last 13 days of logged conditions.
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Create Profile →Frequently asked questions
How often is this page updated?
Current conditions refresh every 3 hours when the cron runs. Hourly data updates every 30 minutes. The 7-day forecast, luck factor, and packing notes are all pre-computed at the same time.
What is the luck factor?
We compare the 7-day forecast to the last 5 years of marine data for the same week at Tanegashima. The delta tells you whether conditions are shaping up better, worse, or about the same as a typical early May.
How is 'best session' picked?
We score each day of the 7-day forecast using the same algorithm as the leaderboard, and highlight the highest scorer.
Where does the data come from?
Open-Meteo's Marine API (swell height, period, water temperature) and Weather API (wind and conditions).
Does the score capture local knowledge?
Honestly, no. Every break has tide windows, swell directions and reef contours that a global model cannot see. Treat the score as a starting point, then check a local cam.
When is the best time to surf Tanegashima?
Check our timing score heatmap above for a week-by-week breakdown combining surf conditions with crowd pressure.